var data = {
    "Something: true,
    "Something else": false,
    "Blah": false,
    "a fish ISA": true
};

var thingFunctions = Object.keys(data).filter(function(e) {
    return typeof data[e] == 'function'
});

var data = {
    "Something": true,
    "Something else": false,
    "Blah": false,
    "a fish ISA": true
};

var thingFunctions = Object.keys( data ).filter(function( e ) {
    return (data[ e ] === true);
});

console.log( thingFunctions );

// Will result in [ 'Something', 'a fish ISA' ]